Core concepts for fast power reactors. Optimization of the physical characteristics of the BN-1600 reactor

The paper describes a general approach to the choice and optimization of physical parameters for BN-type fast power reactors. The reactor design features which are important for breeding are considered. Breeding characteristics are evaluated for oxide breeders with consideration of a number of improvements in design and technology permitting an appreciable reduction of doubling time. The possibility of obtaining short doubling times with carbide fuel is evaluated. The results of theoretical studies on a large fast power reactor with a heterogeneous core are reported. It is shown that if metallic uranium is used in the inner blankets it is possible to attain breeding characteristics close to those of carbide-fuel reactors. The safety characteristics of such a reactor are considered. In conclusion, the main considerations underlying the choice and optimization of physical parameters for the BN-1600 reactor are given, together with the calculation results. (author)